JP2011235200A - Gas-liquid dissolution tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that dissolution efficiency of gas into liquid is reduced when undissolved large bubbles sink to a bottom part of a tank body to be sent to a fine bubble generation nozzle if the liquid injected from an injection port splashes back by an impinging part at an inner upper part of the tank body and the amount of liquid injected from the injection port is increased.SOLUTION: Because an inner cap 22 includes a central opening 51 at a part facing an injection port 16a of an injection nozzle 16, even when the amount of liquid injected from the injection port 16a increases, the liquid at the central part having a high injection speed out of the liquid injected from the injection port 16a impinges upon a second impinging part 21 on an inner surface of an outer cap 23 via the central opening 51 provided at the inner cap 22.

Description

  The present invention relates to a gas-liquid dissolution tank used for a fine bubble generating device that ejects fine bubbles into a liquid in a liquid tank, and more specifically, after a gas is pressurized and dissolved in a liquid flowing through a pipeline, The present invention relates to a gas-liquid dissolution tank used in a fine bubble generating apparatus that ejects fine bubbles into a liquid in a tank.

  Conventionally, after the liquid in the liquid tank is circulated outside and the gas is pressurized and dissolved in the liquid, the fine bubbles are jetted into the liquid in the liquid tank again by reducing the pressure with the fine bubble generating nozzle in the liquid tank. There is known a microbubble generator that disperses microbubbles to form a liquid. As this type of microbubble generator, for example, a flow path through which a liquid flows, an air suction port that mixes air with the liquid flowing through the flow path to form a gas-liquid mixed liquid, and a gas-liquid mixed liquid pressurized to flow. A pump for flowing the gas, a gas-liquid dissolution tank for supplying a gas-liquid mixed liquid to dissolve the gas in the liquid to form a gas-liquid dissolution liquid, and reducing the gas-liquid dissolution liquid thus obtained to reduce fine bubbles. There are those composed of fine bubble generating nozzles for generating and containing fine bubbles in the liquid in the liquid tank, the gas-liquid dissolution tank has a tank body and a suction port outside the tank body, and A jet nozzle having a jet port directed upward inside the tank body, a discharge port projecting outside below the liquid level inside the tank main body, and a collision portion above the inside of the tank main body arranged to face the jet port It was composed of (E.g., Patent Document 1). And by this conventional technology, the gas-liquid mixed liquid is jetted to the upper collision part upwardly from the jet outlet inside the gas-liquid dissolution tank and collided, so that the high-pressure portion of the local gas is gas-liquid. Since the upper portion of the dissolution tank is filled and the filled high-pressure gas is easily dissolved in the liquid, the dissolution efficiency in the liquid can be improved. Furthermore, since the liquid spouted from the spout is a structure that rebounds by the collision part above the inside of the tank body, it becomes a scattered state, so the area when landing on the liquid surface in the tank body increases, That is, by increasing the contact area of the gas with the liquid, the dissolution efficiency in the liquid can be further improved.

JP 2009-112909 A

  However, since the gas-liquid dissolution tank used in the conventional fine bubble generating apparatus has a structure in which the liquid ejected from the ejection port is rebounded by the collision portion inside the tank body, the liquid ejected from the ejection port As the amount increases, the amount of liquid that collides with the collision portion also increases, and when the liquid collides with the liquid surface in the tank body, a large force acts on the liquid surface in the tank body. Therefore, when undissolved large bubbles sink to the bottom of the tank body and the undissolved large bubbles are sent from the discharge port to the fine bubble generating nozzle, the dissolution efficiency of the gas dissolved in the liquid decreases (the fine bubbles are reduced). In addition, there is a problem that noise generated when the gas-liquid dissolved liquid passes through the discharge port becomes large. In order to solve this problem, it is necessary to provide a discharge port in a deep place so that undissolved large bubbles are not discharged from the discharge port, and if the discharge port is provided in a deep place, the tank body is enlarged. New problems arise.

  The present invention has been made in view of the above problems, and provides a gas-liquid dissolution tank used for a fine bubble generator that can improve gas-liquid dissolution efficiency without increasing the size of the gas-liquid dissolution tank. With the goal.

In order to solve the above problems and achieve the above object, the first aspect of the present invention provides:
This is a gas-liquid dissolution tank used in a microbubble generator, in which gas is pressurized and dissolved in the liquid flowing through the pipe, and then fine bubbles are ejected into the liquid in the liquid tank. An opening is provided at the top. A tank main body capable of storing liquid therein, a jet nozzle for jetting liquid sucked from the outside of the tank main body toward the upper side of the tank main body from a jet outlet provided inside the tank main body, There is a collision part that communicates with the outside, is provided below the liquid level stored inside the tank body, and is detachably attached to the opening of the tank body, and the liquid ejected from the ejection port collides with it. A space between the inner cap and the upper surface of the inner cap, and an outer cap that is detachably attached to the inner cap. The inner cap is a through-hole in the collision portion, and is an ejection nozzle. At the spout A central opening provided at the facing portion, and a return opening for returning the liquid ejected from the ejection port to the tank body in the space between the inner cap and the outer cap through the central opening. Is characterized in that a second collision part is provided in the space between the inner cap and the outer cap via the central opening, where the liquid ejected from the ejection port collides.

  According to the present invention, as in the prior art, the gas-liquid mixed liquid is jetted to the upper collision part upwardly from the jet outlet inside the gas-liquid dissolution tank to be collided, whereby a high-pressure portion of the local gas Is filled in the upper part of the gas-liquid dissolution tank, and the filled high-pressure gas is easily dissolved in the liquid, so that the dissolution efficiency in the liquid can be improved. Furthermore, since the liquid ejected from the ejection port is rebounded by the upper collision portion of the tank body, the liquid is scattered and the area when landing on the liquid surface in the tank body is increased. That is, the dissolution efficiency in the liquid can be improved by increasing the contact area of the gas with the liquid.

  Further, since the inner cap is provided with a central opening at a position facing the ejection port of the ejection nozzle, even if the amount of liquid ejected from the ejection port increases, Thus, the liquid at the central portion having a high ejection speed collides with the second collision portion on the inner surface of the outer cap through the central opening provided in the inner cap. As a result, the high-pressure portion of the local gas is filled in the space between the inner cap and the outer cap, and this filled high-pressure gas is easily dissolved in the liquid, so that the dissolution efficiency in the liquid is improved. be able to. Further, the liquid ejected from the ejection port into the space between the inner cap and the outer cap through the central opening collides with the second collision portion on the inner surface of the outer cap and bounces off, and returns from the return opening provided in the inner cap. Return to the tank body and drop (spout) on the liquid level in the tank body. In this way, the jetting speed of the liquid jetted to the liquid level in the tank body through the return opening is suppressed, and the liquid is not jetted to the bottom of the tank main body, so it is necessary to enlarge the gas-liquid dissolution tank The gas-liquid dissolution efficiency can be improved. In addition, the liquid on the outer peripheral side having a low ejection speed among the liquid ejected from the ejection port collides with the collision portion provided in the inner cap, so that the high-pressure portion of the local gas is in the gas-liquid dissolution tank. Since the high-pressure gas filled in the upper part is easily dissolved in the liquid, the dissolution efficiency in the liquid can be improved.

  According to a second aspect of the present invention, there is provided a gas-liquid dissolution tank according to the first aspect, wherein the inner cap is fitted integrally with the opening of the tank body, and the outer cap is the inner cap. And fitted together.

  According to the present invention, the inner cap is fitted and integrated with the opening of the tank body, and the outer cap is fitted and integrated with the inner cap. Therefore, the inner cap can be firmly attached and the internal water leaks to the outside. There is nothing.

  The third aspect of the present invention is the gas-liquid dissolution tank according to the first or second aspect, wherein the central opening of the inner cap has substantially the same shape as the ejection port of the ejection nozzle. It is characterized by.

  According to the present invention, since the central opening of the inner cap has substantially the same shape as the jet outlet of the jet nozzle, it is ensured that the liquid in the central portion having a fast jet speed is reliably opened in the liquid jetted from the jet outlet. You can enter the club. As a result, the ejection speed of the liquid ejected to the liquid surface in the tank body is reliably suppressed, and the liquid is not ejected to the bottom of the tank body, so there is no need to enlarge the gas-liquid dissolution tank. The dissolution efficiency can be improved.

According to a fourth aspect of the present invention, there is provided a gas-liquid dissolution tank according to any one of the first to third aspects, wherein the central opening of the inner cap is a tapered through-hole of the tip. It is characterized by being.

  According to the present invention, since the central opening of the inner cap is a tapered through-hole of the first stop, the liquid at the central portion having a high ejection speed among the liquid ejected from the ejection port is introduced into the central opening. It becomes easy. As a result, the liquid at the central portion, which has the fastest ejection speed among the liquid ejected from the ejection port, is surely introduced into the central opening, and the ejection speed of the liquid falling (spouting) on the liquid surface in the tank body is reduced. It can be reliably suppressed.

  According to a fifth aspect of the present invention, there is provided a gas-liquid dissolution tank according to any one of the first to fourth aspects, wherein the collision portion of the inner cap is formed from a downward concavo-convex shape, and the central opening of the inner cap The part is characterized by being surrounded by the convex part of the collision part.

  According to the present invention, since the central opening of the inner cap is surrounded by the convex part of the collision part, the liquid in the central part having a high ejection speed among the liquids ejected from the ejection port becomes the convex part of the collision part. It is possible to reliably enter the central opening without colliding. In addition, the liquid on the outer peripheral side, which has a low ejection speed among the liquid ejected from the ejection port, collides with a collision part having a downward concavo-convex shape, thereby increasing the area where the liquid ejected from the ejection port collides. It becomes possible to make a local high-pressure part efficiently. Thereby, the melt | dissolution efficiency to the gas liquid further improves.

  According to the sixth aspect of the present invention, there is provided a gas-liquid dissolution tank according to the fifth aspect, wherein the height of the concavo-convex shape of the collision part is low at the center part and gradually increases toward the periphery of the inner cap. It is characterized by.

  According to the present invention, the height of the concavo-convex shape of the collision part is low at the central part and gradually increases toward the peripheral edge of the inner cap, so that the liquid ejected from the ejection port is collected without being dispersed after the collision. Therefore, the local high-pressure portion can be efficiently formed, and the dissolution efficiency of the gas into the liquid can be further improved.

  According to a seventh aspect of the present invention, there is provided a gas used in a fine bubble generating apparatus for jetting fine bubbles into a liquid in a liquid tank after the gas is pressurized and dissolved in the liquid flowing through the pipe. A liquid dissolution tank, which is provided with an opening in the upper part, a tank main body capable of storing liquid therein, and liquid sucked from the outside of the tank main body from a jet outlet provided in the tank main body. An ejection nozzle that ejects upward, communicates with the outside of the tank body, and is provided integrally with the discharge port provided below the liquid level contained inside the tank body and the opening of the tank body. The cap and the integrated cap include a collision portion where the liquid ejected from the ejection port collides, a central opening provided at a location facing the ejection port of the ejection nozzle in the through hole inside the collision portion, The back of the collision through the central opening To a second collision section liquid ejected from the ejection port in the space it will collide, and a return opening for returning the liquid impinging on said second collision portion to the tank body, characterized in that the provided.

  According to the present invention, as in the first aspect of the present invention, the gas-liquid mixed liquid is locally ejected from the ejection port toward the upper collision portion in the gas-liquid dissolution tank and collided locally. Since the high-pressure portion of the gas is filled in the upper part of the gas-liquid dissolution tank and the filled high-pressure gas is easily dissolved in the liquid, the dissolution efficiency in the liquid can be improved. Furthermore, since the liquid ejected from the spout is rebounded by the collision part above the inside of the tank main body, the area when landing on the liquid surface in the tank main body is increased because it is scattered, that is, By increasing the contact area of the gas with the liquid, the dissolution efficiency in the liquid can be improved.

  Since the central cap is provided with a central opening at a location facing the ejection port of the ejection nozzle, even if the amount of liquid ejected from the ejection port increases, The liquid in the central portion having a high ejection speed collides with the second collision portion of the integral cap via the central opening provided in the integral cap. As a result, the high-pressure portion of the local gas is filled in the space between the rear surface of the collision portion and the second collision portion of the integral cap, and the filled high-pressure gas is easily dissolved in the liquid. The dissolution efficiency of can be improved. Further, the liquid ejected from the ejection port into the space between the rear surface of the collision part of the integral cap and the second collision part of the integral cap through the central opening collides with the second collision part and rebounds, and is provided in the integral cap. It returns to the tank body from the return opening and is ejected to the liquid level in the tank body. In this way, the jetting speed of the liquid jetted to the liquid level in the tank body through the return opening is suppressed, and the liquid is not jetted to the bottom of the tank main body, so it is necessary to enlarge the gas-liquid dissolution tank The gas-liquid dissolution efficiency can be improved. In addition, the liquid on the outer peripheral side having a low ejection speed among the liquid ejected from the ejection port collides with the collision part provided in the integral cap, so that the high-pressure portion of the local gas is in the gas-liquid dissolution tank. Since the high-pressure gas filled in the upper part is easily dissolved in the liquid, the dissolution efficiency in the liquid can be improved.

  As described above, according to the gas-liquid dissolution tank used in the fine bubble generating apparatus of the present invention, the gas-liquid dissolution efficiency can be improved without increasing the size of the gas-liquid dissolution tank.

It is a schematic block diagram of the fine bubble generator in which the gas-liquid melt | dissolution tank in one Embodiment of this invention is used. (A) It is a side view of the gas-liquid melt | dissolution tank in one Embodiment of this invention. (B) It is a top view of the same gas-liquid dissolution tank. (C) It is a figure which shows the AA cross section. (A) It is a side view of the tank main body in one Embodiment of this invention. (B) It is a top view of the tank main body. (C) It is a figure which shows a BB cross section. (A) It is a side view of the internal cap used for the gas-liquid melt | dissolution tank in one Embodiment of this invention. (B) It is a bottom view of the internal cap. (C) It is a figure which shows CC cross section. (A) It is a side view of the external cap used for the gas-liquid melt | dissolution tank in one Embodiment of this invention. (B) It is a bottom view of the same external cap. (C) It is a figure which shows DD cross section. It is a figure which shows the AA cross section of the gas-liquid dissolution tank in the modification 1 of this invention. (A) It is a bottom view of the inner cap used for the same gas-liquid dissolution tank. (B) It is a figure which shows the EE cross section. It is a figure which shows the AA cross section of the gas-liquid dissolution tank in the modification 2 of this invention. It is a figure which shows the AA cross section of the gas-liquid melt | dissolution tank in the modification 3 of this invention. (A) It is a bottom view of the inner cap used for the gas-liquid dissolution tank in the modification 3 of this invention. (B) It is a figure which shows the FF cross section. It is a figure which shows the AA cross section of the gas-liquid melt | dissolution tank in the modification 4 of this invention. It is a figure which shows the EE cross section of the gas-liquid dissolution tank in the modification 5 of this invention. (A) It is a side view of the integral cap used for the gas-liquid dissolution tank in the modification 5 of this invention. (B) It is a bottom view of the same body cap. (C) It is a figure which shows a GG cross section.

  Hereinafter, an embodiment of a gas-liquid dissolution tank used in the fine bubble generator of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram of a fine bubble generator in which a gas-liquid dissolution tank according to an embodiment of the present invention is used.

  As shown in FIG. 1, a fine bubble generating nozzle 3 is installed in the liquid in the liquid tank 1. Similarly, a pump 5 is connected to the suction port 2 installed in the liquid via a suction line 4 outside the liquid tank 1. A gas introduction pipe 7 having a gas suction port 6 for sucking gas in an atmosphere such as air is disposed in the suction pipe 4 on the suction port side of the pump 5. A gas-liquid dissolution tank 8 for dissolving the gas sucked from the gas suction port 6 into a liquid is disposed on the downstream side of the pump 5. The pump 5 and the gas-liquid dissolution tank 8 are communicated by an inflow conduit 9. The liquid is circulated to the fine bubble generating nozzle 3 installed in the liquid in the liquid tank 1 by the discharge pipe 10 on the downstream side of the gas-liquid dissolution tank 8 to form the fine bubble generating device A.

  Next, the gas-liquid dissolution tank used for the fine bubble generator of the present invention will be described. Here, FIG. 2 (a) is a side view of a gas-liquid dissolution tank used in the fine bubble generating apparatus in one embodiment of the present invention, and FIG. 2 (b) is a top view of the gas-liquid dissolution tank. FIG. 2 (c) is a diagram showing a cross section taken along the line AA of FIG. 2 (b).

  As shown in FIG. 2, the gas-liquid dissolution tank 8 has a tank body 11, an internal cap 22, and an external cap 23. Here, the tank body 11 is a container that contains a liquid therein and dissolves the gas in the liquid. The internal cap 22 is a cap that is attached to the opening 50 at the top of the tank body 11, and the external cap 23. Is a cap attached to the inner cap 22 at the upper part of the inner cap 22. Thus, by attaching the inner cap 22 to the tank body 11 and attaching the outer cap 23 to the inner cap 22, the upper portion of the tank body 11 is sealed. The tank main body 11 and the inner cap 22, and the inner cap 22 and the outer cap 23 are provided with a female screw on one side and a male screw on the other side, and are detachably mounted in a screwed integral (fitted integral). In this embodiment, as a manner of attaching (detaching) the tank main body 11 and the inner cap 22, and the inner cap 22 and the outer cap 23, the fitting is integrated with a male screw on one side and a female screw on the other side ( However, the present invention is not limited to this. For example, a mode in which rubber is bonded in one concave portion and the other convex portion is press-fitted into the concave portion may be used. Other mounting methods may be used. Further, the joint portions of the tank body 11 and the inner cap 22, and the inner cap 22 and the outer cap 23 are sealed by an O-ring 13. In the present embodiment, the outer cap 23 is attached to the inner cap 22, but the present invention is not limited to this, and the outer cap 23 may be attached to the tank body 11. In the present embodiment, the inner cap 22 is attached to the inner cap 22. Although it was made to attach to the tank main body 11, not only this but the internal cap 22 may be attached to the external cap 23, and the external cap 23 to which the internal cap 22 was attached may be attached to the tank main body 11 (also in a modified example). The same).

  Next, the tank main body used for the gas-liquid dissolution tank of the present invention will be described. Here, FIG. 3 (a) is a side view of a tank body used in the gas-liquid dissolution tank in one embodiment of the present invention, and FIG. 3 (b) is a top view of the tank body. (C) is a figure which shows a BB cross section.

  As shown in FIG. 3, the tank body 11 is provided with an opening 50 in the upper portion, and can store a liquid therein. A jet nozzle 16 is connected from the side wall 11c of the tank body 11 to the tank body 11 to connect the suction port 14 connected to the inflow conduit 9 and the jet port 16a in the tank body 11 (FIG. 3 ( c)). The jet nozzle 16 a of the jet nozzle 16 is directed upward, and the jet port 16 a is disposed at a position higher than the liquid level 17 in the gas-liquid dissolution tank 8. In the present embodiment, the ejection nozzle 16 is described as a part of the structure of the tank body 11, but the ejection nozzle 16 and the tank body 11 may be considered as separate components. In addition, the tank body 11 is provided with a discharge port 19 that communicates with the outside of the tank body 11 and is located below the liquid level 17 that is accommodated inside the tank body 11. Thus, the liquid flows into the tank body 11 from the ejection port 16 a of the ejection nozzle 16, and the liquid in the tank body 11 is ejected from the ejection port 19.

  Next, the inner cap used in the fine bubble generator of the present invention will be described. Here, FIG. 4A is a side view of the inner cap used in the gas-liquid dissolution tank in one embodiment of the present invention, and FIG. 4B is a bottom view of the inner cap. (C) is a figure which shows CC cross section.

  As shown in FIG. 4, the inner cap 22 is detachably attached to the opening 50 of the tank main body 11, and has a collision portion 20 in which liquid ejected from the ejection port 16 a of the ejection nozzle 16 collides. A plurality of annular ribs 18 having a downward concavo-convex shape are formed downward on the lower surface of the collision portion 20 of the inner cap 22. The plurality of annular ribs 18 formed in the downward direction have a low height at the center, and gradually increase toward the periphery and extend downward to form an inclined uneven bottom surface. In other words, when the tips of the annular ribs 18 are connected, a surface inclined from the central portion toward the periphery is formed. Further, the inner cap 22 is provided with a central opening 51 and a return opening 52. The central opening 51 is a through-hole penetrating a part of the inside of the collision part 20, and is an opening provided at a position facing the ejection port 16 a of the ejection nozzle 16. The central opening 51 has substantially the same shape as the ejection port 16a of the ejection nozzle 16, and is formed in a tapered shape of the tip. As described above, since the central opening 51 is formed in a tapered shape with a first stop, as described later, the liquid in the central portion where the ejection speed is fast among the liquid ejected from the ejection port 16 is the central opening 51. It is easy to introduce in. The return opening 52 is an opening for returning the liquid between the inner cap 22 and the outer cap 23 to the tank body 11. In the present embodiment, a plurality of annular ribs 18 having a concave-convex shape are provided on the collision part 20 of the inner cap 22. However, the annular ribs 18 are not necessarily provided on the collision part 20. The collision portion 20 of the inner cap 22 may be a surface having no unevenness (the same applies to the modified examples). In the present embodiment, the central opening 51 is formed in a tapered shape with a first stop, but the present invention is not limited to this, and it may be a cylindrical through-hole having the same cross section.

  Next, the external cap used for the fine bubble generator of the present invention will be described. Here, FIG. 5 (a) is a side view of the external cap used in the gas-liquid dissolution tank in one embodiment of the present invention, and FIG. 5 (b) is a bottom view of the external cap. (C) is a figure which shows DD cross section.

  As shown in FIG. 5, the outer cap 23 forms a space between the upper surface portion of the inner cap 22 and is detachably attached to the inner cap 22. The outer cap 23 has a cup shape with a U-shaped cross section (see FIG. 5C). Then, as will be described later, of the liquid ejected from the ejection port 16a, the liquid ejected through the central opening 51 of the inner cap 22 collides with the second collision portion 21 provided on the inner surface of the outer cap 23. It is like that. In the present embodiment, the second collision part 21 on the inner surface of the outer cap 23 is a curved surface without unevenness. However, the present invention is not limited to this, and the second collision part 21 on the inner surface of the outer cap 23 faces downward as well. A plurality of annular ribs 18 each having an uneven shape may be provided.

  Next, the movement of the fine bubble generator using the gas-liquid dissolution tank of the present invention will be described with reference to FIG.

  When the power supply of the pump 5 is turned on, the liquid in the liquid tank 1 is sucked into the pump 5 from the suction port 2 through the suction pipe 4. At that time, the gas introduced in the middle of the suction pipe 4 is introduced. Since gas is sucked from the gas suction port 6 of the pipe 7, the liquid sucked into the pump 5 is in a gas-liquid mixed state. Here, since the gas introduction pipe 7 uses the structure of the ejector mechanism, it is naturally aspirated without requiring any special power. Then, the liquid in the gas-liquid mixed state is pressurized by the pump 5 and sent to the gas-liquid dissolution tank 8 through the inflow conduit 9.

  In the gas-liquid dissolution tank 8, the gas-liquid mixed liquid sucked from the suction port 14 is ejected from the ejection port 16 a of the ejection nozzle 16. Among the gas-liquid mixed liquid ejected from the ejection port 16a, the liquid in the central portion having a high ejection speed penetrates the central opening 51 provided at the location of the inner cap 22 facing the ejection port 16a of the ejection nozzle 16. Then, it collides with the second collision part 21 on the inner surface of the outer cap 23. As described above, among the gas-liquid mixed liquid ejected from the ejection port 16a, the liquid in the central portion having a high ejection speed collides with the second collision portion 21 on the inner surface of the outer cap 23 to create a local high-pressure portion. Can do. As a result, the high-pressure portion of the local gas is filled in the space between the inner cap 22 and the outer cap 23, and the filled high-pressure gas is easily dissolved in the liquid. Can be improved. Further, the liquid ejected into the space between the inner cap 22 and the outer cap 23 through the central opening 51 collides with the second collision portion 21 on the inner surface of the outer cap 23 and bounces back, and is then provided on the inner cap 22. It returns to the tank body 11 from the return opening 52 and falls to the liquid surface 17 in the tank body 11. As described above, the liquid that has dropped onto the liquid surface in the tank body 11 through the return opening 52 has a low speed, so that the liquid does not sink to the vicinity of the bottom 11a of the tank body 11 and is not dissolved. Large bubbles are not discharged from the discharge port 19.

  Further, the liquid on the outer peripheral side having a low ejection speed among the liquid ejected from the ejection port 16a collides with the collision part 20 provided in the inner cap 22, so that the high-pressure portion of the local gas is dissolved in the gas-liquid. Since the upper part in the tank 8 is filled and the filled high-pressure gas is easily dissolved in the liquid, the dissolution efficiency in the liquid can be improved. Furthermore, in the present embodiment, a plurality of annular ribs 18 are formed downward on the inner surface of the inner cap 22 in order to increase the contact area of the gas with the liquid and increase the dissolution efficiency. The height of each of the ribs 18 is provided so as to be inclined so that the central portion is lower and is gradually increased toward the peripheral edge. Therefore, each of the ribs provided by the ejected gas-liquid mixed liquid from the central portion to the peripheral edge is provided. 18 can collide with each other, and a local high-pressure portion can be created between each rib 18. This also can further improve the dissolution efficiency of the gas in the liquid. In addition, the plurality of downward annular ribs 18 on the inner surface of the inner cap 22 can increase the collision area of the liquid ejected from the ejection port 16a, and can be used for landing on the liquid surface 17 in the tank body 11. The area of the liquid surface 17 can be enlarged. Thus, by uniformly expanding the area when the liquid surface 17 in the tank body 11 is landed, the contact area between the gas and the liquid is increased, and the dissolution efficiency of the gas into the liquid can be improved. That is, since the gas in the gas-liquid mixed liquid pressurized by the pump 5 is filled in the upper part of the tank body 11, the gas and liquid in the gas-liquid mixed liquid filled in the upper part of the tank body 11 By increasing the contact area, the dissolution efficiency of the gas in the liquid can be improved.

  In addition, since the liquid ejected from the ejection port 16 a rebounds on the lower surface of the inner cap 22, the area of the liquid surface 17 when landing on the liquid surface 17 in the tank main body 11 is expanded to the liquid surface 17. Since the jetting pressure for landing is suppressed, it is possible to suppress undissolved large bubbles from flowing to the bottom portion 11a of the lower portion of the tank body 11.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  Next, a modified example of the present invention will be described.

(1) In the present embodiment, the ribs 18 on the lower surface of the inner cap 22 are formed into a plurality of annular ribs 18 having an uneven shape, which are lower in the central portion and gradually higher toward the peripheral edge of the inner cap 22. The rib 118 on the lower surface of the inner cap 122 is not limited to this, and is formed by a plurality of inferior arc-shaped ribs 118 (symmetrical), which are lower at the center and sequentially higher toward the periphery of the inner cap 122. (See FIGS. 6 and 7). Here, FIG. 6 is a diagram showing an AA cross section of the gas-liquid dissolution tank in Modification 1 of the present invention. Moreover, Fig.7 (a) is a bottom view of the internal cap used for the gas-liquid dissolution tank in the modification 1 of this invention, FIG.7 (b) is a figure which shows EE cross section. According to the configuration of the first modification, the area of the liquid collision portion 120 ejected from the ejection port 16a of the ejection nozzle 16 in the tank body 11 is narrowed by the arc-shaped rib 118 (see FIG. 6). 1 also causes a collision between the ejected gas-liquid mixed liquid and each rib 118 from the central portion to the peripheral edge, so that a local high-pressure portion can be formed in each rib 118, and the gas is dissolved in the liquid. Efficiency can be improved. Further, since the arc-shaped rib 118 is formed on the inner surface of the inner cap 122, the collision area is expanded in the chord direction of the arc, and the scattering state can be increased. Thereby, since the water landing area to the liquid level 17 also becomes large, the contact area to the gas liquid can be enlarged, and the dissolution efficiency to the gas liquid can be improved. Thus, the modification 1 can have the same effect as that of the embodiment of the present invention. Also in the first modification, the central opening 51 of the inner cap 122 is surrounded by the convex part of the collision part 120. Thus, since the central opening 51 of the inner cap 122 is surrounded by the convex part of the collision part 120, the liquid in the central part having a fast ejection speed is the liquid of the collision part 120 in the liquid ejected from the ejection port 16 a. It is possible to reliably enter the central opening 51 without colliding with the convex portion. In addition, the liquid on the outer peripheral side having a low ejection speed among the liquid ejected from the ejection port 120 collides with the collision portion 120 having a downward concavo-convex shape, so that the liquid ejected from the ejection port 16a collides. Becomes larger, and a local high-pressure portion can be efficiently made. Thereby, the melt | dissolution efficiency to the gas liquid further improves. Further, the other configuration of the central opening 51 has the same configuration as that of the present embodiment. Therefore, the operation and effect of the central opening 51 of the first modified example have the same operation and effect as the operation and effect of the central opening 51 of the present embodiment.

  (2) In the present embodiment, the ejection nozzle 16 connecting the suction port 14 connected to the inflow conduit 9 and the ejection port 16a in the tank body 11 is piped from the side wall 11c of the tank body 11 into the tank body 11. However, the present invention is not limited to this, and the ejection nozzle 216 that connects the suction port 214 and the ejection port 216a may be linear, and the ejection nozzle 216 may be disposed vertically from below the tank body 211 (see FIG. 8). ). Here, FIG. 8 is a view showing an AA cross section of the gas-liquid dissolution tank in Modification 2 of the present invention. Even the configuration of Modification 2 can have the same effect as that of the embodiment of the present invention.

  (3) In the present embodiment, the ribs 18 on the lower surface of the inner cap 22 are formed into a plurality of annular ribs 18 having a concave and convex shape, which are lower at the center and gradually higher toward the periphery of the inner cap 22. Not limited to this, the rib 318 on the lower surface of the inner cap 322 is formed from a single long protrusion that faces downward, and the gas-liquid mixed liquid ejected from the ejection port 316a of the ejection nozzle 316 collides within the range of the rib 318. You may do it. According to the configuration of the third modification, the collision portion 320 where the gas-liquid mixed liquid ejected from the ejection port 316 a of the ejection nozzle 316 collides is a narrow range inside the rib 318. Here, FIG. 9 is a view showing an AA cross section of the gas-liquid dissolution tank in Modification 1 of the present invention. Moreover, Fig.10 (a) is a bottom view of the internal cap used for the gas-liquid dissolution tank in the modification 1 of this invention, FIG.10 (b) is a figure which shows FF cross section. Even the configuration of the third modification can have the same effect as that of the embodiment of the present invention. Note that also in the third modification, the central opening 51 of the inner cap 322 is surrounded by the convex part of the collision part 320. Further, the other configuration of the central opening 51 has the same configuration as that of the present embodiment. Therefore, the operation and effect of the central opening 51 of the modified example 3 have the same operation and effect as the operation and effect of the central opening 51 of the present embodiment.

  (4) Further, surplus gas in the gas-liquid dissolution tank 8 is further discharged to the gas-liquid dissolution tank 8 of the present embodiment and the first to third modifications, and the liquid level 17 in the gas-liquid dissolution tank 8 is discharged. An air vent valve 421 for keeping the height constant may be provided (see FIG. 11). By providing the air vent valve 421 in this manner, even if the amount of gas sucked from the gas suction port 6 changes, the displacement of the liquid surface 17 is suppressed, and the stable gas-liquid mixed liquid to gas-liquid dissolved liquid can be suppressed. A conversion effect can be obtained. Here, FIG. 11 is a figure which shows the AA cross section of the gas-liquid dissolution tank in the modification 4 of this invention.

  (5) In this embodiment, the inner cap 22 that is detachably attached to the opening 50 of the tank body 11 and the outer cap 23 that is detachably attached to the inner cap 22 are provided. Instead of the inner cap 22 and the outer cap 23, an integrated cap 500 in which the inner cap 22 and the outer cap 23 are integrated may be provided. As shown in FIGS. 12 and 13, the integral cap 500 of the modified example 5 is provided at a location facing the collision portion 520 where the liquid ejected from the ejection port 16 a collides with the central portion of the ejection port 16 a of the ejection nozzle 16. A central opening 551 provided, a second collision part 521 that collides with liquid ejected to the space on the back surface of the collision part 520 through the central opening 551, and a liquid that collides with the second collision part 521 And a return opening 552 returning to the main body 11. The integral cap 500 is also detachably attached to the opening 50 of the tank body 11. Here, FIG. 12 is a figure which shows the AA cross section of the gas-liquid dissolution tank in the modification 5 of this invention, and FIG. 13 (a) is used for the gas-liquid dissolution tank in the modification 5 of this invention. FIG. 13B is a side view of the integral cap, FIG. 13B is a bottom view of the integral cap, and FIG. 13C is a diagram showing a GG cross section.

DESCRIPTION OF SYMBOLS 1 Liquid tank 2 Suction port 3 Fine bubble generation nozzle 4 Suction line 5 Pump 6 Gas suction port 7 Gas introduction pipe 8 Gas-liquid dissolution tank 9 Inflow line 10 Discharge line 11 Tank main body 11a Bottom part 11c Side wall 13 O-ring 14 Suction Port 16 Ejection nozzle 16a Ejection port 17 Liquid surface 18 Rib 19 Discharge port 20 Collision part 21 Second collision part 22 Inner cap 23 External cap A Fine bubble generator 50 Opening 51 Central opening 52 Return opening 118 Rib 120 Collision 122 Inner cap 211 Tank main body 214 Suction port 216 Ejection nozzle 216a Ejection port 316 Ejection nozzle 316a Ejection port 318 Rib 320 Collision part 322 Internal cap 421 Air vent valve 500 Integrated cap 520 Collision part 521 Second collision part 551 Central opening part 552 Return opening Part

Claims (7)

A gas-liquid dissolution tank used in a fine bubble generating device for jetting fine bubbles into liquid in a liquid tank after gas is pressurized and dissolved in a liquid flowing through a pipeline,
An opening is provided at the top, and a tank body that can store liquid inside,
An ejection nozzle for ejecting the liquid sucked from the outside of the tank body toward the upper side of the tank body from an ejection port provided inside the tank body;
Communicating with the outside of the tank body, a discharge port provided below the liquid level accommodated inside the tank body;
An internal cap that is detachably attached to the opening of the tank body and has a colliding portion with which liquid ejected from the ejection port collides,
A space is formed between the upper surface of the inner cap, and the outer cap has an outer cap that is detachably mounted;
The inner cap is
A central opening provided at a location facing the jet outlet of the jet nozzle in the through hole inside the collision portion;
A return opening for returning the liquid ejected from the ejection port to the tank body in the space between the inner cap and the outer cap via the central opening;
The outer cap is
A second collision part where the liquid ejected from the ejection port collides with the space between the inner cap and the outer cap through the central opening;
A gas-liquid dissolution tank provided. The inner cap is fitted integrally with the opening of the tank body,
The gas-liquid dissolution tank according to claim 1, wherein the outer cap is fitted and integrated with the inner cap.   3. The gas-liquid dissolution tank according to claim 1, wherein the central opening of the inner cap has substantially the same shape as the ejection port of the ejection nozzle. The gas-liquid dissolution tank according to any one of claims 1 to 3, wherein the central opening of the inner cap is a tapered through-hole of a first throttle. The collision portion of the inner cap is formed from a concave-convex shape facing downward,
The gas-liquid dissolution tank according to any one of claims 1 to 4, wherein a central opening of the inner cap is surrounded by a convex portion of the collision portion.   6. The gas-liquid dissolution tank according to claim 5, wherein the height of the concavo-convex shape of the collision part is low at the center part and gradually increases toward the periphery of the inner cap. A gas-liquid dissolution tank used in a fine bubble generating device for jetting fine bubbles into liquid in a liquid tank after gas is pressurized and dissolved in a liquid flowing through a pipeline,
An opening is provided at the top, and a tank body that can store liquid inside,
An ejection nozzle for ejecting the liquid sucked from the outside of the tank body toward the upper side of the tank body from an ejection port provided inside the tank body;
Communicating with the outside of the tank body, a discharge port provided below the liquid level accommodated inside the tank body;
An integral cap detachably attached to the opening of the tank body;
The integral cap is
A collision portion where liquid ejected from the ejection port collides;
A central opening provided at a location facing the jet outlet of the jet nozzle in the through hole inside the collision portion;
A second collision part in which the liquid ejected from the ejection port collides with the space on the back surface of the collision part through the central opening;
A return opening for returning the liquid colliding with the second collision part to the tank body;
A gas-liquid dissolution tank.

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